Try a Textured Twist

Crave a relaxed routine? Nettles does, too. "I don't have the patience to fuss with my hair!" says the singer, who styles herself on tour. In fact, bed-head is central to her laid-back look, says Frankie Foye, her stylist in New York City.

The how-tos Shampoo in the evening, then work a curl cream into damp hair and let air-dry before you turn in. In the A.M., twirl any flat-looking pieces around a curling iron (try the John Frieda Loose Curls 1 1/4" Curling Iron, $30) in the direction of your hair's natural wave. Finish with hairspray, or twist large sections on each side of your part and bobby-pin them to the back of your crown to add definition.

Copy Her Honey Color

It's simple to get and maintain Nettles's chunky honey-blonde highlights: Ask your colorist for lots of blonde balayage (thicker highlights) where the sun hits naturally, says Nicola Clarke, a creative color director for John Frieda in London. Then let the highlights grow out. (Yes, really.) If your roots look more forgotten than fabulous as they start to show, touch them up with a more golden version of your natural hue, carefully keeping dye on roots only. The biggest perk of this sexy-messy look? You won't be "Stuck Like Glue" to your colorist's chair!

Keep it spotlight-worthy Cutting down on salon visits is a major money-saver, but you'll have to work harder at home to keep your color looking bright. Prevent fading by using a UV blocker such as Sally Hershberger Hyper Hydration Super Argan Serum, $15, every morning.

Steal Her On-Tour Tricks

When it comes to primping on the road, Nettles likes to unplug. She air-dries her hair at night, then uses a volumizing dry shampoo and tons of hairspray in the morning. "I'm from the South, and growing up, I noticed a direct correlation between the amount of hairspray I used and my self-confidence," Nettles jokes. "Even when I have access to my stylist, I always grab the spray can and give my hair an extra spritz before I feel totally ready."

Insider tip Don't want to wait for your hair to air-dry? After smoothing a curl cream through your hair post-shower, dry it using a diffuser and your fingers.

Score Sleeker Strands

Leona Lewis's so-straight style is so achievable. It's all about how you handle your tools.

The soulful star first wowed the judges of Britain's The X Factor sporting springy golden curls but now embraces straighter, gleaming hair and a rich dark-brown hue.

The how-tos You don't need a pro blowout to achieve a seriously smooth look. The key is using a boar-bristle brush that grips your hair well so it pulls your strands straight as you brush. Doing this adds shine and makes the blowout last, says Ben Cooke, Lewis's stylist and cofounder of Lockonego Salon in London. Start by separating hair into sections and pinning top layers out of the way. Then dry the bottom layers in sections as wide as the brush, pointing the dryer down at a 45-degree angle and following the brush with the dryer's nozzle to head off frizz. Add bounce to ends by winding them around a 1-inch curling iron. If you have bangs, brush them side to side as you dry; polish with a mini straightening iron.

Copy Her Healthy Color

Switching from blonde to brunette as Lewis did means less maintenance. (And we're for that!) To keep brown shades bright, "all you need are a few random foil highlights, ideally done at the salon, to add dimension," Clarke says. Just as important is developing a "Bleeding Love" for deep conditioning. Thoroughly comb an ultra-hydrating mask through hair before you shampoo, suggests Sarah Potempa, a stylist with Aussie in Jersey City, New Jersey. (SELF likes Garnier Fructis Sleek & Shine Fortifying Deep Conditioner, $6.) When you rinse, your hair will look fuller, healthier and eye-catchingly shiny.

Keep it spotlight-worthy Skipping your shampoo? Work a leave-in conditioner into dry hair to amp up shine.

Steal Her On-Tour Tricks

Heavy bangs are this busy Brit's best-kept secret. "Fringe can help hide roots, so if you have highlights, you can stretch the time between color appointments to almost three months," Clarke says. "As your highlights grow out, the remaining pops of color will add a rock-and-roll edge to the style." As for combating frizzies, try keratin. "Leona has had a keratin straightening treatment, which makes styling considerably easier," Cooke says. (Good thing, because Lewis will be in the studio this summer working on her next album—no time for salon breaks!) If you're not ready to shell out the cash for a pro keratin fix, opt for a gentle, at-home option such as KeratinPerfect 30-Day Brazilian Hair Smoothing System Essentials Collection, $95.

Insider tip To make this style look sleek, not shaggy, make sure to get your bangs trimmed every four to six weeks. Ask if your stylist will do it for free between cuts or if she can teach you how to do it yourself.

Pull Off a Boho Bun

Intricate braids look girly, but they're tough enough to stay put when Stefani is giving her all on stage. (That's saying a lot.) The style takes 15 minutes but lasts hours.

The how-tos Start by spraying on a body enhancer through wet strands. (We like L'Oréal Paris Studio Line Pumping Volume Spritz, $5.) Then blow-dry, creating a side part. Next, trace your finger along your part 2 inches back from your forehead, then straight over to the opposite temple, as if you were drawing two sides of a triangle. Clip the separated front piece out of the way, spritz the remaining pieces with a flexible-hold hairspray, and pull them into a high ponytail, suggests Johnny Lavoy, a hair expert with L'Oréal Paris in NYC. Braid the pony, twist it around itself, and secure with bobby pins. Finally, split the remaining front section of hair into two even pieces, braid each, secure ends with tiny hair bands, and tuck both into your bun. Pin in place. If your hair is long enough, you can wrap the braids around the bun before you secure. Finish with a mist of hairspray and you'll be ready to let loose.

Copy Her Bright Color

Platinum hair has been a frequent Stefani style since No Doubt's early days in the '90s. Impressive, because it's one of the highest-maintenance color choices out there, "which means you should always get it done at the salon," Clarke says. Pay tribute to the blonde bombshell by asking for a pure bleach process to zap any shade from your hair. (It may be too harsh for some brunettes, so discuss with your colorist.) Then have her add icy—not golden—highlights all over. At home, make sure to use a violet-color shampoo (such as Philip Kingsley Pure Silver Shampoo, $22); the light-purple cast will neutralize any yellow that creeps in. Once a week or so, switch to a chelating shampoo, such as Bumble and Bumble Sunday Shampoo, $20, which will wash away potentially dulling minerals.

Keep it spotlight-worthy To look classy, not brassy, platinum needs to be touched up every three weeks. (We know—pricey. That's why we're warning you!)

Steal Her On-Tour Tricks

Hair like Stefani's is low-maintenance in one way: Because dyed-blonde hair tends to be drier, it doesn't need daily washing. (A bonus on tour.) In fact, platinum gals can probably get away with a once-a-week wash. If you must lather up more often, apply a leave-in conditioner at bedtime the night before you shampoo to keep strands luminous.

Insider tip Tons of in-salon maintenance isn't the only caveat with this color: You also need to "play up eyebrows, eyelashes and lips with makeup daily," Clarke says, as light hair can wash you out. Try a brown brow pencil, an ultra-black volumizing mascara and a bold-as-you-dare lipcolor. (Stefani favors reds.)

Twirl Casual Curls

Corinne Bailey Rae's sunny songs and funky style are the ideal match for freewheeling weekends. Wash once, then you're set for the week!

This singer keeps her hairstyle groovy with a curl-loving cut and a few easy tips.

The how-tos Sleeping in four to seven tight braids is the best way to calm coarse coils after shampooing and conditioning, says Donna Tripodi, a master stylist and colorist at Eva Scrivo Salon in NYC. The tension from the braids will straighten the hair so it lies slightly flatter against your head, while the braids relax extra tight coils. In the A.M., unwind, then touch up flat pieces with a curling wand; finish with a dose of hydrating oil. (Rae loves Shu Uemura Essence Absolue, $65.)

Copy Her Rich Color

Rae's dark shade is natural, but her sleek shine is enhanced with a clear, semipermanent glaze every six to eight weeks, says Tripodi, who styles the star when she's in NYC. Like a hair dye, a clear glaze flattens the hair's cuticle to cut frizz and add shine. Can't picture it? Think of a sequined skirt: If the sequins are sticking up, the skirt looks dull; if they're flat, the skirt sparkles and feels smooth.

Keep it spotlight-worthy You're better off getting a semipermanent glaze like Rae's in a salon, Tripodi says. Why? If you leave it on too long, the treatment can lift color, creating ruddy undertones in virgin and dyed hair. If you really want to do it yourself, use a nonchemical product such as Fekkai Salon Glaze, $28. It coats hair to increase shine without opening hair's cuticle and risking damage.

Steal Her On-Tour Tricks

"Once Corinne's hair is washed and dried, it actually gets better as the week goes on, because she adds a light layer of hydrating oil every day, which helps preserve the curls without adding any poufiness," Tripodi says. (This trick works best when you have very dry or very coarse hair.) Before you do wash your hair, brush it from roots to ends with a boar-bristle brush. Brushing pulls your scalp's natural oil to the parched bottom half of strands—it's as if you're giving your dry ends a hydrating facial without using any products.

Insider tip Rae likes her hair to look imperfect and natural. (A tiny bit of frizz has become part of her signature look.) The point: Don't take styling too seriously.